I recieved the new MREV mod in the mail!!
11-18-2005, 09:06 AM
#1
I recieved the new MREV mod in the mail!!
Can't wait until I install it. I will be doing pre/post dyno's on it and some before and afterf real world tests.
Unfortunately I still have to wait another 600 miles until I break her in until I can get it on the dyno. Attached are some pics of this mod which include the 5/16" spacer and the modified lower 287 plenum.
Unfortunately I still have to wait another 600 miles until I break her in until I can get it on the dyno. Attached are some pics of this mod which include the 5/16" spacer and the modified lower 287 plenum.
11-18-2005, 09:39 AM
#2
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so uh.....what exactly IS the MREV mod? ok i see a 287 lower plenum, how is it modified?
also, is that the lower collector from the 287 as well?
also, is that the lower collector from the 287 as well?
11-18-2005, 09:51 AM
#3
Originally Posted by HarvesterUT
so uh.....what exactly IS the MREV mod? ok i see a 287 lower plenum, how is it modified?
also, is that the lower collector from the 287 as well?
also, is that the lower collector from the 287 as well?
11-18-2005, 01:47 PM
#6
Originally Posted by Diesel350
The MREV mod is a 5/16" spacer + a 287 lower plenum. Yes it's a whole lower plenum from the 287 engine. It is modified by machining down runners 1 & 2. And I think maybe something else. I don't remember, maybe Tony can chime in.
BTW will you still be doing the 40-100 MPH test? I'm really curious to see the difference in time it makes.
Tony
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11-18-2005, 04:53 PM
#12
Originally Posted by Hydrazine
You described it correctly. That's exactly what it is. A 287 lower collector modified for more flow clearance above runners 1&2 and a 5/16" Iso Thermal plenum spacer.
BTW will you still be doing the 40-100 MPH test? I'm really curious to see the difference in time it makes.
Tony
BTW will you still be doing the 40-100 MPH test? I'm really curious to see the difference in time it makes.
Tony
11-18-2005, 04:56 PM
#13
Originally Posted by amsweigart@hotm
That looks sweet! Will it get in the way of the stock sway bar? Oh and how much?
11-18-2005, 07:17 PM
#14
Originally Posted by Diesel350
Yes I will be doing those tests also. Tony, what's the ease of install of this mod for a novice?
1) Remove strut bar and air tube.
2) Remove upper collector.
3) Remove lower collector and stock gasket.
4) Install Aramid gasket.
5) Install the new lower collector.
6) Install the 5/16" spacer and CCV.
6) Reinstall the upper collector.
7) Reinstall the strut bar and air tube.
And you are done.
I can do it by myself in 45min. You can do it with the help of a friend in about 2 hours.
11-19-2005, 07:58 AM
#16
Originally Posted by hitop
You so lucky, too bad us 03 models can't use it.
The 300 motor (REV-UP) Makes its power in the higher RPM's and beyond...
The Rev-UP Plenum is what does this...
The REV-UP motor makes its power up top, so, power is not as strong in the lower RPM's, but up High it fly's...
For the Daily Driver, they can not take full advantage of the REV-UP motor. Most daily drivers do not spend much time in the 5500-7000 RPM range where the REV-UP motor shines...
So putting the 287 HP motor plenum on it makes up for that difference.
The 287 HP Plenum stops making horse power above 6000 RPM, so a spacer is needed to make up for that difference or the car will feel dead above...
If you spend more time in the lower RPM's its a good mod
REV UP motors have been safley run with no modification to the internals up to 7800 RPM and made power till just below then, with a new cam even more HP will be made up to there... So, if you run up to 7800 RPM on the REV-UP motor you will have more constant peak HP at high RPM's which will be sweet on the track... Daily Driving / Free Way driving will not really see this power...
With the 287 plenum, shift points will have to be changed to lower RPM's to take advantage of the power...
11-19-2005, 08:22 AM
#17
Originally Posted by thezedsled
Why? Please explain...
Several different variations of modifications to the lower collector were tried on the dyno. Some were machined very deeply. Some were cut across all the runners. Some were cut only a little. It was found that the machining only runners 1&2 was optimum. And the depth of cut must be done just the amount for it to work. Too much or too little machining and the gains drop off. The convergence to the inlet must also be appropriatly radiused.
When used in conjunction with a 5/16" plenum spacer the difference is similar to what you would see in a comparison between the 5/16" and 1/2" spacer. About 1-1.5 HP at the top end. (when used without a spacer the gains will be around 5-7 HP)
But what I also recently found on the dyno (both the 287 and 300 HP engine) is that the 5/16" creates more area under the curve below 5K RPM. While the 1/2" spacer creates slightly more HP above 5K. I believe the difference in TQ is due to the difference in plenum volume. The difference in HP is due to the clearance above runners 1&2. So by combining the modified collector with a spacer, it gives you the best of both. Lower internal volume for improved TQ and more clearance above runners 1&2 for improved HP.
There are other factors involved that also affect both HP and TQ but it gets more complicated.
Tony
Last edited by Hydrazine; 11-19-2005 at 08:26 AM.
11-19-2005, 06:27 PM
#19
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so just for clarification, for us that have the 287 Motor, its better to mod the lower plenum as opposed to modifying the upper plenum for getting a spacer??
11-19-2005, 08:27 PM
#20
Originally Posted by InsaneChink
so just for clarification, for us that have the 287 Motor, its better to mod the lower plenum as opposed to modifying the upper plenum for getting a spacer??
The modification is for 2 situations.
1) if you want the greatest possible stealth and don't even want a spacer visible.
2) You can use it to modestly enhance the highend of the HP curve. It will give gains similar to the 1/2" spacer on the high end without sacrificing TQ in the mid range.